Merge pull request #71 from blat/2.16.x

Fix content deflating for IIS HTTP responses

src/Response.php

@@ -14,10 +14,12 @@
 use function gzuncompress;
 use function hexdec;
 use function implode;
+use function in_array;
 use function is_array;
 use function is_float;
 use function is_numeric;
 use function is_scalar;
+use function ord;
 use function preg_match;
 use function sprintf;
 use function strlen;
@@ -648,7 +650,7 @@ protected function decodeDeflate($body)
          */
         $zlibHeader = unpack('n', substr($body, 0, 2));
 
-        if ($zlibHeader[1] % 31 === 0) {
+        if ($zlibHeader[1] % 31 === 0 && ord($body[0]) === 0x78 && in_array(ord($body[1]), [0x01, 0x5e, 0x9c, 0xda])) {
             return gzuncompress($body);
         }
         return gzinflate($body);

test/ResponseTest.php

@@ -288,6 +288,22 @@ public function testNonStandardDeflateResponseLaminas6040()
         $this->assertEquals('c830dd74bb502443cf12514c185ff174', md5($res->getContent()));
     }
 
+    /**
+     * Make sure there no confusion with complient "deflate" responses.
+     *
+     * @link https://framework.zend.com/issues/browse/ZF-12457.html
+     */
+    public function testStandardDeflateResponseLaminas12457()
+    {
+        $responseTest = file_get_contents(__DIR__ . '/_files/response_deflate_iis_valid');
+
+        $res = Response::fromString($responseTest);
+
+        $this->assertEquals('deflate', $res->getHeaders()->get('Content-encoding')->getFieldValue());
+        $this->assertEquals('fa2f670a2da7cd7f0aee953ce5785fa8', md5($res->getBody()));
+        $this->assertEquals('992ec500e8332df89bbd9b8e998ec8c9', md5($res->getContent()));
+    }
+
     public function testChunkedResponse()
     {
         $responseTest = file_get_contents(__DIR__ . '/_files/response_chunked');